<template lang="">
    <div>
        <input type="button" value="+1" @click="addNum" />
        {{num}}
        <input type="button" value="-1" @click="subNum" />
    </div>
</template>

<script>
export default {
    data(){
        return { num: 0};
    },
    methods: {
        addNum() {
            this.num++;
        },
        subNum() {
            this.num--;
        },
    },
};
</script>
<style lang="">
    
</style>